What the component does
A Walton–Beckett graticule defines a sampling field and visual comparison references for compatible fibre-counting methods.
Fibre & Airborne Dust Microscopy
Define a repeatable microscope sampling field for fibre counting and comparison of airborne-particle deposits.
Where the component works
Calibrate before evaluating the deposit
- Graticule inside the eyepiece
- Stage reference at the specimen plane
- Observation field with deposited fibres
The eyepiece field must be calibrated for the objective and observation method.
Apply the method within the defined field
- Defined circular sampling boundary
- Fibre crossing the field boundary
- Deposit features to assess
The drawing shows why boundary rules matter; fibre eligibility and counting rules come from the selected method.
How the system works together
Calibrate the field at the working magnification, then sample the prepared deposit according to the method rather than selecting only visibly dense regions.
What an unsuitable choice changes
An incorrect field size changes the sampled area. A graticule does not identify fibre composition or replace the required sample preparation and optical conditions.
Components for this application
Walton–Beckett Fibre-Counting Graticules
Method-specific fibre counting fields and comparison marks.
Particle-Sizing Comparison Reticles
Compare projected dust and particle dimensions.
Eyepiece Micrometer Reticles
Calibrated eyepiece divisions for feature-length comparison.
Principles and selection details
System context
Collected samples can contain elongated fibres and irregular particles that need different observation rules. A fibre graticule provides a defined field and comparison features, while particle references help classify projected size. Sample preparation and the selected method determine which features are counted.
Selection considerations
Choose a Walton–Beckett pattern when the method requires its counting field and dimensional conventions. Use particle-comparison references for particle-size tasks. Calibrate the field in the actual microscope configuration and distinguish visual counts from chemical identification.
Systematic observation of a filter
Moving through defined fields helps avoid repeatedly sampling the same region. Keep the field selection, boundary rules and magnification consistent. The graticule supports a counting procedure; sampling adequacy depends on the method and the collected specimen.
Different pattern versions have different roles
Reference circles, aspect-ratio features and counting-field boundaries vary between designs. Choose the actual geometry called for by the method rather than treating G22, G24 and G25 as size variants of one identical drawing.
Related applications
Planning your project
Fibre and dust microscopy uses defined fields and comparison features to organise observation.
Fibre counting and particle-size classification require different references. Verify field and scale in the actual microscope configuration.
Are G22, G24 and G25 simply different sizes of one pattern?
Check each pattern's geometry and comparison features against the actual method. Similar names or appearance do not establish interchangeability.